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PROPERTIES OF MATTER Physical and Chemical
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All substances have properties that we can use to identify them.
For example we can identify a person by their face, their voice, height, finger prints, DNA etc. The more of these properties that we can identify, the better we know the person.
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In a similar way, matter has properties - and there are many of them.
There are two basic types of properties that we can associate with matter. These properties are called Physical properties and Chemical properties:
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What is a PHYSICAL PROPERTY of matter?
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PHYSICAL PROPERTY Characteristic that can be observed without changing the identity of the substance. Properties that do not change the chemical nature of matter.
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PHYSICAL PROPERTY Examples: Color Shape Texture Size Taste Odor Length
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TAKE SOME NOTES…
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Mass and Volume Mass: the amount of matter in an object/substance
g, kg Volume: The amount of space an object takes up mL or cm3
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Density the amount of matter in a certain amount of space;
D= mass/volume; (g/cm3 or g/mL)
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ELASTICITY “stretchy-ness” the ability to return to original shape
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ABSORBENCY Ability of a substance to “soak up” a liquid
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TAKE SOME NOTES…
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CONDUCTIVITY The ability of a substance to allow energy to flow through it; “conductor” or “insulator”
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STATE OF MATTER @ room temperature
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SPECIAL TEMPS MELTING POINT FREEZING POINT BOILING POINT
CONDENSING POINT
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TAKE SOME NOTES…
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LUSTER “shininess” Substances can be described as Shiny or Dull
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MALLEABILITY Malleable means that a substance is bendable
Malleable substances can be shaped and used for tools
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BRITTLENESS Beakable, crumbles
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TAKE SOME NOTES…
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What is a CHEMICAL PROPERTY of matter?
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CHEMICAL PROPERTY Characteristics that describe how substances can form new substances. Characteristics that can ONLY be observed while the substances changes to a new substance.
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COMBUSTIBILITY/ FLAMMABILITY
describes how well a substance can burn
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OXIDATION: REACTS WITH OXYGEN
Iron rusts – forms orange substance. Silver tarnishes – forms dark gray substance. Copper – forms blue/green substance.
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TAKE SOME NOTES…
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pH: Acid or Base Acid=Vinegar Ammonia=Base pH test is orange/red
pH test is blue/purple
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REACTIVITY Reaction with acid? Reaction with H2O?
Baking soda + vinegar Reaction with H2O? Sodium + water
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TAKE SOME NOTES…
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What do we use properties of matter for?
To identify substances To compare substances To tell one substance from another
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